<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>单向数据流</title>
    <script src='/js/vue.js'></script>
</head>

<body>

    <div id='app'>
        <counter :num="3"></counter>
    </div>

    <script>
        Vue.component('counter', {
            props: ['num'],
            template: '<button @click="num++">点击{{num}}次</button>'
        })
        let app = new Vue({
            el: '#app'
        })
    </script>
</body>

</html>